103.
The development of new jumbo rocket that is expected to carry the United States into its next phase of space exploration will be able to delivery a heavier load of instruments into orbit than the space shuttle and at a lower cost.
OG解釋: "that" is used to introduce restrictive clauses, such clauses are essential to the meaning of a sentence.The that is expected...exploration clause is not essential;it should be replaced by which and set off with commas.
請問要怎麼判斷 that is expected...exploration是非必要的子句呢?
謝謝